Multi-layered phase-change optical recording medium
a multi-layer technology, applied in the field of multi-layered phase-change optical recording mediums, can solve the problems of difficult to obtain light transmittance and heat dissipation effect, difficult to record and reproduce information on the first information layer, etc., to achieve stable recording and reproducing information, high light transmittance, and excellent repeatability. durability and storage stability
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example 1
[0114]On a first substrate composed of a polycarbonate resin having a diameter of 12 cm, a thickness of 0.575 mm, and having convexo-concaves (groove depth: λ / 11.5n)(n=1.55) of a tracking guide formed with a serpentine continuous groove with a track pitch of 0.74 μm and having a groove width of convex portions (groove) of 0.25 μm on one surface thereof, a first lower protective layer composed of ZnS—SiO2 (80:20 (mol %)) having a layer thickness of 70 nm was formed by RF magnetron sputtering method under the conditions of a sputtering power of 4 kW and an Ar flow rate of 15 sccm.
[0115]Next, on the first lower protective layer, a first recording layer composed of Ag0.2In3.5Ge7Sb68.7Te20.6 having a layer thickness of 7.5 nm was formed by DC magnetron sputtering method under the conditions of a sputtering power of 0.4 kW and an Ar flow rate of 35 sccm.
[0116]Next, on the first recording layer, a first upper protective layer composed of In2O3—ZnO—SnO2—Ta2O5 (7.5:22.5:60:10 (mol %)) having...
examples 41 to 49 and reference examples 14 to 18
[0136]Two-layered optical recording media each having the same substrates and the same layer configuration as those of Example 1 were prepared, except that the material composition of the recording layer was changed to the material composition shown in Table 3. The prepared optical recording media were tested as to recording properties and storage stability.
[0137]A jitter (DOW10 jitter) after repeatedly recording 10 times at a recording linear velocity of 9.2 m / s was measured, a jitter value less than 10% was evaluated as “A” and a jitter value of 10% or more was evaluated as “B”. Further, when a jitter variation obtained after being left at 80° C. for 300 hours was less than 2%, it was evaluated as “A”, and when a jitter variation obtained after being left at 80° C. for 300 hours was 2% or more, it was evaluated as “B”. The two-layered phase-change optical recording medium was stored in a thermostatic bath set at 80° C. and a relative humidity of 85% for 300 hours to thereby carry ...
examples 50 to 65
[0139]Two-layered phase-change optical recording media each having the same substrates and the same layer configuration as those of Example 1, except that the material composition of the first upper protective layer was changed to the composition as shown in Tables 4 and 5. The prepared optical recording media were tested.
[0140]A transition linear velocity of the first information layer and a jitter value obtained after repeatedly recording 10 times were evaluated. The evaluation results showed that the sputtering rate was almost the same, however, when any one of ZnO or SnO2 was contained at 50 mol % or more, the recording properties of the optical recording medium were enhanced because the transition linear velocity was improved.
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